| Business | Phone |
| A Aaaronco 276 Spring Gate Blvd, Thornhill L4J 3L9 | (905) 731-3111 |
| Aaa Aacademy Plumbing Ltd 10 Mulberry Mews, Thornhill L3T 5V7 | (905) 889-4757 |
| Aimcorp Mechanical Ltd 107 Dina Rd, Thornhill | (905) 761-6533 |
| Jennstar Plumbing 60 Kirk Dr, Thornhill L3T 3L1 | (905) 764-9070 |
| New Water Plumbing Inc 34 Doncaster Ave #10, Thornhill L3T 4S1 | (905) 731-2066 |
| Dial-A-Plumber Inc 32 Kimbergate Way, Thornhill L4J 6R5 | (905) 886-1700 |
| Stern Plumbing 195 North Meadow Cres, Thornhill L4J 3C4 | (905) 709-9677 |
| Target Plumbing & Heating 125 Mcclintock Cres, Thornhill L4J 2S8 | (905) 669-6472 |
| Vml Plumbing Inc 57 Glen Cameron Rd, Thornhill L3T 1P3 | (905) 763-8670 |
| Byno Mechanical Plumbing 77 Maple Sugar Lane, Thornhill L4J 8M8 | (905) 882-4574 |
| Carewell Plumbing Ltd 138 York Hill Blvd, Thornhill L4J 2P6 | (905) 771-6975 |